I live in a poor country. I don't speak for myself. I speak for those who can buy a new tv for 1500 dollar.
There are folks, believe or not, who prefer watching their stuff in front of their computer screen. When you're watching in a group, a TV is obviously better, but solo, i much prefer what i get from my Computer. I just can't get the same level of immersion when i'm sitting 3 feet away from the screen.
Yes, eventhough it gets smoother i don't see that smooth effect on head movements or hair animations. I only get to see those effects when i use to screen.
What is your Motion vector grid size set to?
Interpolating to a integral multiplier is definitely the way to go. Much better quality while being much less taxing to your systems resources.... The only reason not to use it is if you can't figure out how to set your screen to a custom resolution/refresh rate. For maximum smoothness, you have to avoid framedrops which is only possible if your screen is set to the refresh-rate you are interpolating to.